#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int level=0,n,i,count=0,lev;
    cin>>n;
    char c[n];
    cin>>c;
    for(i=0;i<n;i++){
        lev=level;
        if(c[i]=='D')
            level--;
        else if(c[i]=='U')
            level++;
        if(lev<level&&level==0)
            count++;
    }
    cout<<count;
    return 0;
}